Granted Patent
Utility
US 5,709,544 · App. 08/639,033
Dual seal for a vacuum heat treating furnace
Inventor:
Brian J. Wurtz
Patented Case
View Patent ↗
Granted: Jan 20, 1998
Filed: Apr 16, 1996
Inventor
Brian J. Wurtz
Assignee (at issue)
Abar Ipsen Industries, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.